Filling valve



FIG. 1 is a diagrammatic perspective view of the filling valve;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view of the filling valve;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view of the filling valve; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a filling valve, as shown and described. 